791
FNCA52 TJSJ 041930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST MON MAY 4 2026
DISCUSSION
A FIRE DANGER STATEMENT (RFDSJU) WAS ISSUED EARLY THIS MORNING
FOR TODAY. AS ANTICIPATED, NO RAINFALL HAVE BEEN SEEN ACROSS THE
SOUTHERN SECTIONS OF PUERTO RICO TODAY AND DRIER AIR MASS OVER
THE REGION IS ALLOWING RELATIVE HUMIDITY VALUES TO DROP INTO
CRITICAL FIRE WEATHER THRESHOLDS. AS OF 1:30 PM AST, THE CABO
ROJO AND GUANICA RAWS STATIONS HAVE BEEN REGISTERING RH VALUES IN
THE LOW 50S AND WINDS SPEEDS IN AROUND 10 TO 18 MPH, WITH GUST
AROUND 20 TO 27 MPH. KBDI VALUES IN CABO ROJO REMAIN ABOVE
CRITICAL FIRE WEATHER THRESHOLDS. ADDITIONALLY, THE 7-DAY PERCENT
OF NORMAL RAINFALL ACROSS THE SOUTHEASTERN COASTAL PLAIN,
INCLUDING AREAS NEAR SALINAS, IS BELOW 25%, WITH SOME LOCATIONS
EVEN BELOW 5%. THEREFORE, CONDITIONS REMAIN FAVORABLE FOR THE
SPREAD OF WILDFIRES ALONG THE SOUTHERN COASTAL PLAINS OF PUERTO
RICO.
PRZ014-050800-
SOUTHEAST COASTAL PLAINS-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 10 10
TEMP (24H TREND) 73 (-2) 89 (+1) 73 89
RH % (24H TREND) 91 (+6) 55 (-1) 89 53
WIND 20FT/EARLY(MPH) E 9 E 13 E 10 E 14
WIND 20FT/LATE(MPH) E 9 SE 13 E 9 SE 16
MIXING HGT(FT-AGL/MSL) 4270 4890
TRANSPORT WND (MPH) SE 15 E 15
VENT RATE (KT-FT) 55510 63570
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-050800-
SOUTHERN HILLS-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 10 10
TEMP (24H TREND) 69 (-4) 86 (+3) 70 87
RH % (24H TREND) 97 (+8) 63 (-2) 95 61
WIND 20FT/EARLY(MPH) E 9 SE 12 E 9 E 11
WIND 20FT/LATE(MPH) E 9 SE 12 E 10 SE 12
MIXING HGT(FT-AGL/MSL) 4890 5760
TRANSPORT WND (MPH) SE 14 E 13
VENT RATE (KT-FT) 58680 63360
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-050800-
NORTH COASTAL PLAINS-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 30 10
TEMP (24H TREND) 72 (-3) 91 (+1) 71 90
RH % (24H TREND) 97 (+8) 58 (0) 96 57
WIND 20FT/EARLY(MPH) SE 11 SE 14 SE 10 E 12
WIND 20FT/LATE(MPH) SE 9 E 16 SE 10 E 18
MIXING HGT(FT-AGL/MSL) 5120 5030
TRANSPORT WND (MPH) E 13 E 14
VENT RATE (KT-FT) 56320 60360
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-050800-
NORTHERN HILLS-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 50 0 30
TEMP (24H TREND) 70 (-2) 90 (+1) 69 89
RH % (24H TREND) 97 (+6) 60 (+4) 96 59
WIND 20FT/EARLY(MPH) SE 10 SE 11 SE 9 E 10
WIND 20FT/LATE(MPH) LGT/VAR E 12 SE 5 E 14
MIXING HGT(FT-AGL/MSL) 5590 6220
TRANSPORT WND (MPH) SE 10 E 10
VENT RATE (KT-FT) 50310 55980
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-050800-
WEST COAST-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 0 30 0 10
TEMP (24H TREND) 73 (-1) 91 (+1) 73 91
RH % (24H TREND) 95 (+7) 60 (+1) 95 59
WIND 20FT/EARLY(MPH) SE 11 SE 14 SE 12 E 13
WIND 20FT/LATE(MPH) E 6 E 14 E 11 SE 13
MIXING HGT(FT-AGL/MSL) 4670 4610
TRANSPORT WND (MPH) SE 15 E 12
VENT RATE (KT-FT) 60710 46100
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-050800-
EASTERN INTERIOR-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 30 20
TEMP (24H TREND) 71 (-3) 87 (+1) 71 88
RH % (24H TREND) 98 (+9) 62 (-2) 95 61
WIND 20FT/EARLY(MPH) SE 11 SE 14 SE 11 E 12
WIND 20FT/LATE(MPH) SE 11 SE 14 SE 12 SE 12
MIXING HGT(FT-AGL/MSL) 5860 6190
TRANSPORT WND (MPH) SE 14 SE 13
VENT RATE (KT-FT) 70320 68090
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-050800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 50 20
TEMP (24H TREND) 70 (-3) 83 (+3) 70 83
RH % (24H TREND) 99 (+8) 69 (-4) 98 66
WIND 20FT/EARLY(MPH) SE 9 SE 13 SE 10 SE 11
WIND 20FT/LATE(MPH) SE 9 SE 13 SE 10 E 11
MIXING HGT(FT-AGL/MSL) 4050 4530
TRANSPORT WND (MPH) SE 17 SE 12
VENT RATE (KT-FT) 60750 45300
DISPERSION 5 5
DSI 4 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-050800-
CENTRAL MOUNTAIN RANGE-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 40 0 10
TEMP (24H TREND) 67 (-3) 87 (+4) 67 86
RH % (24H TREND) 98 (+7) 63 (-1) 97 61
WIND 20FT/EARLY(MPH) SE 5 SE 11 SE 6 E 8
WIND 20FT/LATE(MPH) LGT/VAR SE 9 SE 5 SE 9
MIXING HGT(FT-AGL/MSL) 5650 7320
TRANSPORT WND (MPH) E 9 E 8
VENT RATE (KT-FT) 45200 51240
DISPERSION 5 5
DSI 1 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-050800-
CAYEY MOUNTAIN RANGE-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 30 20
TEMP (24H TREND) 70 (-2) 82 (+1) 69 83
RH % (24H TREND) 100 (+8) 70 (-1) 97 66
WIND 20FT/EARLY(MPH) E 8 SE 12 SE 8 E 10
WIND 20FT/LATE(MPH) E 8 SE 11 E 9 SE 10
MIXING HGT(FT-AGL/MSL) 4840 5140
TRANSPORT WND (MPH) SE 14 E 14
VENT RATE (KT-FT) 58080 61680
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-050800-
VIEQUES-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 50 20
TEMP (24H TREND) 76 (-2) 87 (+1) 76 87
RH % (24H TREND) 88 (+5) 63 (-2) 87 62
WIND 20FT/EARLY(MPH) E 13 SE 17 SE 13 E 14
WIND 20FT/LATE(MPH) E 13 SE 16 E 14 E 12
MIXING HGT(FT-AGL/MSL) 2700 3290
TRANSPORT WND (MPH) SE 18 E 20
VENT RATE (KT-FT) 43200 55930
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-050800-
CULEBRA-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 50 10
TEMP (24H TREND) 77 (-2) 89 (+2) 77 89
RH % (24H TREND) 91 (+8) 62 (-5) 89 61
WIND 20FT/EARLY(MPH) E 13 SE 18 SE 13 E 13
WIND 20FT/LATE(MPH) E 13 SE 17 E 14 E 12
MIXING HGT(FT-AGL/MSL) 2890 3280
TRANSPORT WND (MPH) SE 17 E 20
VENT RATE (KT-FT) 43350 55760
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-050800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 0 10 0 0
TEMP (24H TREND) 74 (-1) 91 (+2) 74 91
RH % (24H TREND) 93 (+9) 52 (0) 89 51
WIND 20FT/EARLY(MPH) E 14 E 18 E 17 E 18
WIND 20FT/LATE(MPH) E 11 SE 18 E 13 SE 19
MIXING HGT(FT-AGL/MSL) 4270 4790
TRANSPORT WND (MPH) SE 15 SE 20
VENT RATE (KT-FT) 55510 81430
DISPERSION 5 5
DSI 4 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-050800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 50 10
TEMP (24H TREND) 74 (-4) 86 (+1) 75 86
RH % (24H TREND) 97 (+12) 65 (-3) 93 64
WIND 20FT/EARLY(MPH) E 14 SE 18 E 14 E 13
WIND 20FT/LATE(MPH) E 14 SE 17 E 14 E 12
MIXING HGT(FT-AGL/MSL) 2790 3180
TRANSPORT WND (MPH) E 17 E 21
VENT RATE (KT-FT) 41850 57240
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-050800-
ST CROIX-
330 PM AST MON MAY 4 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 20 10
TEMP (24H TREND) 76 (-2) 87 (+1) 76 87
RH % (24H TREND) 90 (+7) 64 (-5) 91 64
WIND 20FT/EARLY(MPH) E 14 SE 16 E 14 E 13
WIND 20FT/LATE(MPH) E 14 SE 14 E 14 E 12
MIXING HGT(FT-AGL/MSL) 4200 4340
TRANSPORT WND (MPH) SE 21 E 16
VENT RATE (KT-FT) 75600 60760
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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